Sole-laying device



Feb. 4, 1930. A. DEMNITZ I 1,7,45 984 I SOLER LAYING DEVICE Fild July 29. 1925 Jbvenfor:

Patented Feb. 4, 1930 UNITED STATES ALBERT DEMNITZ, OF

DRESDEN, GERMANY SOLE-LAYING DEVICE I Application filed July 29,

' This inyention relates to shoe sole laying devices and more particularly to pneumatic cushions for use in this connection.

- According to the present practice in order to lay or stick soles to shoes it has been customary to press the shoe sole against the last by means of solid pressure members, such as rubber or cork plates, and the work piece held in place by means of spindles or the like. This procedureis inconvenient and requires accurate fitting pressure members, the services of special workmen, and in addition. to this consumes a relatively large amount of time.

This invention contemplates a pressure cushion which obviates the above drawbacks and has the special advantage that the pres sure exerted during the operation of laying or sticking the sole to the shoe may be automatically generated and made regulable in order 1 to improve the operation of the device.

A further object of the invention consists in providing a rubber bag having an air inlet and outlet on one side only of the bag and essentially at the central under part thereof. This arrangement provides for the free expansion in all directions of the rubber bag during its inflation within its container,

' which latter constitutes the leather outer cover, thereby avoiding not only distortions and defects of the rubber bag, but also causing the sole to be evenly and intimately laid against the upper'part of the shoe.

In carrying out these objects the invention is susceptible of modifications without departing from the spirit or sacrificing any of the advantages of the claimed invention.

In the accompanying drawings:

Figure 1 represents a longitudinal sectional view partly in elevation of the pressure de-. vice; and

Figure 2 is a top plan view with the pressure lever omitted.

In, carrying this invention into effect the pressure member proper is made somewhat 1925. Serial No. 46,868.

similar to a foot-ball and consists of an outer part made of leather or other flexible material shown at a and encases a pressure generating rubber bag 21 so that the irregular expansion of the rubber bag during its infiation will be limited by the stronger outer casing thereby protecting the bag against burstmg.

The rubber bag 2' is equipped with a combined inlet and outlet valve 0 located at the central under part of the bag and by introducing pressure air into the bag 2' through the valve 0 a pressure will be first exerted against the sole of the shoe at the hollow under part or arch of the foot at the point designated 6 in Figure 1. This pressure will be distributed over the entire sole in such manner that the pressure surface of the bag will fit every part of the shoe to which the sole is fastened by the laying process.

This casing enclosed rubber bag z is placed upon a presser-form g betweensaid form and the last it which latter isadapted and'held in position by means of pressure bolts (1 and e pivoted to the pressure lever 70. The pressure lever is is shown detachably connected by a link Z with the formg at the rear thereof and the front of said lever is connected by a swiveled nut m with a threaded stud 'or rod.

n which projects upwardly from the front end 7 of the supporting structure of the device as is shown clearly in Fig. 1.

The casing a is formed in two parts as shown, stitched together at their marginal edges as indicated at 8, the envelop thus. formed being adapted efiectively to resist pressures set up in the bag z' when a shoe is forced against the cushion and to conform freely and accurately to the shape of the shoe bottom to which a sole is to be applied. Ap- 35 plicants inflatable cushion does not require a special form of support or in other words the shape of the bottom wall of the presser form is immaterial, and does not have to be adjusted.

I claim:

In a machine for applying soles to shoes, an inflatable container comprising an interior rubber bag and a protecting covering therefor, said covering consisting of upper and lower pieces of leather completely surrounding and covering both sides of the bag, and stitching for uniting the meeting edges of the leather covering to completely enclose the bag andprotect it from puncture, and permitting the upper surface of the leather to firmly engage the sole of the shoe.

In testimony whereof I have aflixed' my signature.

ALBERT DEMNITZ. 

